We look at the division of 25816592 by 391 
The aim is to understand the frequency of 391 in 25816592.

Let's proceed to step 1:
391 goes into 2 0 times with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 391

Let's proceed to step 2:
If we divide 25 by 391, we get 0 and a remainder of 25.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 25, we get 25.
Include the next digit (8) from the dividend after 25, then repeat: 258 / 391

Moving on to step 3:
When dividing 258 by 391, we get 0 with a remainder of 258.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 258 after subtracting 0 from 258.
Fetch the next digit (1) from the dividend, attach it to 258 and continue: 2581 / 391

Step 4:
If we divide 2581 by 391, we get 6 and a remainder of 235.
The next digit of our result is 6. 
Result so far: 6.0
Subtracting 2346 from 2581 leaves us with 235.
Append the next digit (6) from the dividend to 235 and continue with: 2356 / 391

Step 5:
391 goes into 2356 6 times with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 66.0
Subtract 2346 from 2356 to get 10.
Append the next digit (5) from the dividend to 10 and continue with: 105 / 391

Going ahead to step 6:
The number 391 fits into 105 0 times, leaving a remainder of 105.
Write down 0 as next digit of the result. 
Result so far: 660.0
Deduct 0 from 105 and we're left with 105.
Include the next digit (9) from the dividend after 105, then repeat: 1059 / 391

Let's proceed to step 7:
If we divide 1059 by 391, we get 2 and a remainder of 277.
Put 2 as the next digit of the answer. 
Result so far: 6602.0
Subtracting 782 from 1059 leaves us with 277.
Grab the next digit (2) from the dividend, add it to 277, then carry on: 2772 / 391

Let's proceed to step 8:
The number 391 fits into 2772 7 times, leaving a remainder of 35.
Put 7 as the next digit of the answer. 
Result so far: 66027.0
If we subtract 2737 from 2772, we get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Advancing to step 9:
391 can be fit into 350 0 times, resulting in a remainder of 350.
Record the quotient 0 as the next digit in the result. 
Result so far: 66027.0
Subtracting 0 from 350 leaves us with 350.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3500, and continue the process.

Moving on to step 10:
391 can be fit into 3500 8 times, resulting in a remainder of 372.
The next digit of our result is 8. 
Result so far: 66027.08
If we subtract 3128 from 3500, we get 372.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3720, and continue the process.

Advancing to step 11:
3720 divided by 391 is 9 with a remainder of 201.
Write down 9 as next digit of the result. 
Result so far: 66027.089
If we take 3519 away from 3720, we end up with 201.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2010, and continue the process.

On to step 12:
391 goes into 2010 5 times with a remainder of 55.
The next digit of our result is 5. 
Result so far: 66027.0895
If we take 1955 away from 2010, we end up with 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Step 13:
391 goes into 550 1 times with a remainder of 159.
Write down 1 as next digit of the result. 
Result so far: 66027.08951
Subtract 391 from 550 to get 159.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1590, and continue the process.

Going ahead to step 14:
1590 divided by 391 is 4 with a remainder of 26.
Use 4 as the next digit of our solution. 
Result so far: 66027.089514
If we subtract 1564 from 1590, we get 26.
Since there are no more digits in the dividend, we add a zero to the remainder making it 260, and continue the process.

Step 15:
If we divide 260 by 391, we get 0 and a remainder of 260.
Record the quotient 0 as the next digit in the result. 
Result so far: 66027.089514
If we take 0 away from 260, we end up with 260.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2600, and continue the process.

Advancing to step 16:
The number 391 fits into 2600 6 times, leaving a remainder of 254.
Write down 6 as next digit of the result. 
Result so far: 66027.08951406
The remainder is 254 after subtracting 2346 from 2600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

In conclusion, the division gives 66027.08951406 with a balance of 2.54e-07.